prime simple

prime.rb

# https://www.codewars.com/kata/stone-bridge-primes/train/ruby
require "prime"

def solve(x,y)
  a = []
 for m in 0..10
   for n in 0..10
     a << calc(m,n)
   end
 end
 ans = a.select{|e| Prime.prime?(e)}.sort.select{|e| e >= x and e < y }.size
   
end

def calc(m,n)
 p_ = 2**m * 3**n + 1

end